Dissakisite-(La) Mineral Data

General Dissakisite-(La) Information
Chemical Formula:	(Ca,Fe++,Th, La)(La,REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F) with La > Ce
Composition:	Molecular Weight = 551.33 gm
	Sodium 0.01 % Na 0.01 % Na₂O
	Strontium 0.16 % Sr 0.19 % SrO
	Calcium 8.69 % Ca 12.15 % CaO
	Lanthanum 7.94 % La 9.31 % La₂O₃
	Cerium 6.66 % Ce 7.80 % Ce₂O₃
	Praeseodymium 0.49 % Pr 0.57 % Pr₂O₃
	Samarium 0.05 % Sm 0.06 % Sm₂O₃
	Gadolinium 0.03 % Gd 0.03 % Gd₂O₃
	Erbium 0.03 % Er 0.03 % Er₂O₃
	Thorium 3.79 % Th 4.31 % ThO₂
	Magnesium 2.74 % Mg 4.55 % MgO
	Scandium 0.02 % Sc 0.03 % Sc₂O₃
	Uranium 0.13 % U 0.15 % UO₂
	Titanium 0.26 % Ti 0.43 % TiO₂
	Manganese 0.09 % Mn 0.12 % MnO
	Aluminum 9.00 % Al 17.00 % Al₂O₃
	Vanadium 0.07 % V 0.12 % VO₂
	Zinc 0.18 % Zn 0.22 % ZnO
	Chromium 1.40 % Cr 1.83 % CrO
	Gallium 0.01 % Ga 0.02 % Ga₂O₃
	Iron 4.08 % Fe 3.13 % FeO / 2.17 % Fe₂O₃
	Silicon 15.13 % Si 32.37 % SiO₂
	Nickel 0.11 % Ni 0.14 % NiO
	Phosphorus 0.04 % P 0.10 % P₂O₅
	Hydrogen 0.18 % H 1.63 % H₂O
	Neodymium 0.99 % Nd 1.16 % Nd₂O₃
	Oxygen 37.70 % O
	Fluorine 0.03 % F 0.03 % F
	- % F -0.01 % -O=F₂
	______ ______
	100.00 % 99.73 % = TOTAL OXIDE
Empirical Formula:	Ca_1.19Mn²⁺_0.009Sr_0.01Na_0.002Th_0.09U_0.003La_0.31Ce_0.26Pr_0.01Nd_0.03Sm_0.002Gd_0.001Er_0.001Al_1.81 Mg_0.62Fe²⁺_0.24Fe³⁺_0.15Cr_0.14(OH)
Environment:	Occurs in peridotite incorporated in a Variscan subducted crustal slab which crystallised under eclogite-facies conditions or during the early stage of retrogression in the amphibol ite facies. Mg-analogue of allanite-(L
IMA Status:	Approved IMA 2003 (Dana # Added)
Locality:	Found in a peridotite body from the Ulten zone (Austroalpine domain, Eastern Alps. Link to MinDat.org Location Data.
Name Origin:	Named for its A2 site cation content and relationship to Dissakisite-(Ce).
Synonym:	IMA2003-007

General Dissakisite-(La) Information